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Tips

Make sure you have a secure way of entering the house.

Light it up! Make sure mobs won't spawn in your house.

Get a wide view of the surrounding area by building your tree house on the tallest tree, make a lookout point or build more floors.

Use a trapdoor to make it look more like a treehouse.

Use Sneak mode (Left Shift by default) so you don't fall from dangerous heights.

If you want to make one fast, just find a tree and build on its branches, but remove some leaves,not all of them but some of them to make it look more like a tree house.

Make it on a really tall tree so you can watch the sunset and see mobs that are far away.

Try creating it in a jungle or creating a jungle around it.

Bone meal instantly turns saplings into full-grown trees

With the wood you obtain from destroying the trees, create wood planks, and a crafting table. Use it to create some sticks out of wood planks, create an axe and torches. Torches are made with coal and a single stick.

Warnings

Destroy the trees in the surrounding area. If you start a forest fire, your work (quite literally) will go up in flames.

Remember not to make it too high as it may be struck by lightning and catch on fire.

Add torches to the surrounding area as well. It will increase the visibility during nighttime, and prevent hostile mobs from spawning. Don't have too many people in the tree.